Make sure we wrap all AsyncErrors in ScheduleErrors.

pkg/scheduled_test/lib/src/schedule.dart

Index: pkg/scheduled_test/lib/src/schedule.dart
diff --git a/pkg/scheduled_test/lib/src/schedule.dart b/pkg/scheduled_test/lib/src/schedule.dart
index 58a14871418f67a2c4e3742d34b5cd49a23f1740..2c7423035c46a142822a1b891ca17c28f6ed646d 100644
--- a/pkg/scheduled_test/lib/src/schedule.dart
+++ b/pkg/scheduled_test/lib/src/schedule.dart
@@ -133,13 +133,13 @@ class Schedule {
       _state = ScheduleState.RUNNING;
       return tasks._run();
     }).catchError((e) {
-      errors.add(e);
+      errors.add(new ScheduleError.from(this, e));
       return onException._run().catchError((innerError) {
         // If an error occurs in a task in the onException queue, make sure it's
         // registered in the error list and re-throw it. We could also re-throw
         // `e`; ultimately, all the errors will be shown to the user if any
         // ScheduleError is thrown.
-        errors.add(innerError);
+        errors.add(new ScheduleError.from(this, innerError));
         throw innerError;
       }).then((_) {
         // If there are no errors in the onException queue, re-throw the
@@ -150,7 +150,7 @@ class Schedule {
       return onComplete._run().catchError((e) {
         // If an error occurs in a task in the onComplete queue, make sure it's
         // registered in the error list and re-throw it.
-        errors.add(e);
+        errors.add(new ScheduleError.from(this, e));
         throw e;
       });
     }).whenComplete(() {